What are some examples of natural fluid systems?

Answer:
Some examples of natural fluid systems are:
1.Our body's circulatory system and respiratory system.
2.The movement of sap in trees
3.The movement of sea stars: Sea stars have several rows of tube feet with suckers at the end. Each tube foot contains fluid. The pressure in the fluid changes when a sea star contracts its muscles. These pressure changes allow the sea star to move and gather food.
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